COMPLIANCE INFO_2024 FINAL SITE CHARACTERIZATION WORK PLAN

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Site Health and Safety Plan Page 15 cave-ins by excavating to form sides of an excavation that are inclined away from the excavation so as to prevent cave-ins. The angle of incline varies with differences in such factors as the soil type, environmental conditions of exposure, and application of surcharge loads. Sloping methods shall be identified by a competent person. If unforeseen solid structures or unidentified utilities are encountered during excavation the excavator will cease operation. Site personnel will continue excavation with hand tools to identify the structures and their extent. 3.5.5 Underground Utilities Reasonable efforts shall be made to identify the location(s) of underground utilities (e.g., pipes, electrical conductors, fuel lines, and water and sewer lines) before intrusive soil work is performed. The state underground utility notification authority (e.g., Dig-Safe, On-Target, Dig Alert, Blue Stake, etc.) shall be contacted prior to the start of intrusive field activities in accordance with local notification requirements. In areas not evaluated or serviced by the underground utility notification authority, and a reasonable potential for underground utilities exists, one or more of the following techniques shall be employed to determine the location of subsurface structures. • Contracting the services of a qualified private utility locator. • Completing a survey of the subject area conducted by staff trained in the use of subsurface utility locating equipment. • Subsurface testing (i.e., hand digging, vactoring, air-lancing or potholing) to the expected depth of probable utilities (not less than 5 feet). If utilities cannot be located or if utilities not located are suspected to be present, subsurface activities (i.e., borings, excavation) shall not be conducted before the location(s) or absence of underground utilities is confirmed. Typical subsurface location marks are as follows: • Red - electrical, • Yellow - gas/oil/steam, • Blue - water, • Green - sanitary/storm drains/culverts, • Orange - telecommunications, and • White - proposed excavation or boring. Intrusive work should be limited to the area 3.3 feet (1 meter) on either side of the location marks. In some special cases such as fiber optics and high-pressure pipelines this area should be expanded to 16.5 feet (5 meters) on either side of the utility. 3.5.6 Overhead Utilities Unlike underground utilities, there is usually strong visual evidence of the existence of overhead utilities on the site. Overhead utilities may include electrical transmission, distribution or service conductors and telecommunication lines. All overhead lines shall be considered energized and unqualified minimum approach distances (MADs) should be observed in accordance with 29 CFR 1910.269(l)(2). Activities that increase the risk of coming in contact with overhead utilities include soil borings, excavating using heavy